Я буду ждать тебя у входа до тех пор, пока не придёт такси.

I will wait for you at the entrance until the taxi arrives.

Breakdown of Я буду ждать тебя у входа до тех пор, пока не придёт такси.

• я: I
• у: at
• вход: the entrance
• прийти: to arrive
• такси: the taxi
• ждать: to wait for
• тебя: you
• до тех пор, пока не: until

Questions & Answers about Я буду ждать тебя у входа до тех пор, пока не придёт такси.

Why is it Я буду ждать and not just Я жду?

Я буду ждать is the explicit future: буду (future of быть) + infinitive ждать = I will wait / I will be waiting.
Я жду is present tense (I’m waiting) and can sometimes imply near-future in context, but it’s not as clearly “future” as буду ждать.

What does the verb ждать require after it—why тебя?

Ждать normally takes the genitive (and sometimes accusative) for the person/thing awaited. With personal pronouns, both are common, but ждать тебя is very natural in everyday speech.

• тебя = genitive/accusative form of ты (you, singular informal).

Could I say вас instead of тебя?

Yes. It changes politeness/number:

• тебя = informal singular you
• вас = polite singular you or plural you (all)
  So: Я буду ждать вас у входа... works if you’re being polite or addressing more than one person.

Why is it у входа—what case is входа?

The preposition у (“by/near/at”) requires the genitive case, so вход becomes входа.
у входа means “near the entrance / by the entrance.”

Could it be на входе or у входа—what’s the difference?

у входа = “by/near the entrance” (most neutral and common).
на входе = literally “on the entrance” but idiomatically more like “at the entrance area / at the doorway,” and it can sound less natural depending on context. If you mean “I’ll be right by the entrance,” у входа is the safest.

What is до тех пор doing here?

до тех пор means “until then / until that point in time” and it strengthens the idea of waiting up to a specific moment. It often pairs with пока:

• до тех пор, пока ... = “until ...” (emphatic, very common)

Can I omit до тех пор and just say пока?

Yes. You can say: Я буду ждать тебя у входа, пока не придёт такси.
It still means “I’ll wait ... until the taxi arrives.” до тех пор just adds emphasis (“right up until the moment when…”).

Why is there не in пока не придёт if the meaning is “until it arrives” (not “until it doesn’t arrive”)?

In Russian, with пока meaning “until,” you normally use не in the subordinate clause:

• пока не придёт = “until (it) arrives”
  This не is a standard grammatical pattern and usually doesn’t add negation in English terms. It’s sometimes called “expletive” or “non-negating” не.

Is the comma mandatory: до тех пор, пока...?

Yes, the comma is standard because пока не придёт такси is a subordinate clause introduced by пока. The main clause is Я буду ждать тебя у входа, so you separate them with a comma.

Why is it придёт (perfective) and not приходит (imperfective)?

After “until,” you refer to a single completed event (the taxi’s arrival), so Russian typically uses the perfective future:

• прийти → придёт = “will arrive (once)”
  приходит is present/imperfective and doesn’t fit well here unless you’re describing a repeated/habitual situation.

Shouldn’t it be приедет такси rather than придёт такси?

Both are possible, but they differ in nuance:

• придёт такси is very common and treats the taxi as “arriving” in a general sense.
• приедет такси is more literal for arriving by vehicle (“will drive up/come by car”).
  In everyday speech, придёт такси is perfectly normal.

What case is такси here, and does it change?

Here такси is the subject of придёт, so it’s nominative. The word такси is typically indeclinable in modern Russian (it usually doesn’t change by case): такси, такси, такси... depending on context.

Can the word order change, and what would it affect?

Russian word order is flexible, but it changes emphasis:

• Neutral: Я буду ждать тебя у входа до тех пор, пока не придёт такси.
• Emphasis on place: У входа я буду ждать тебя... (“By the entrance, I’ll wait for you...”)
• Emphasis on time limit: ...пока не придёт такси, я буду ждать тебя у входа. (more literary/marked)
  The basic meaning stays the same; the focus shifts.